In 1.14 if your server difficulty is set to HARD zombies have a 100% chance of being infected if killed by a villager, therefore it is possible for players to infect/cure villagers over and over to stack discounts until the villager trades everything for 1 emerald.
A new setting has been added to the config:
ZombieVillagerTransformChance: 100
This setting defaults to 100, so you'll need to change it if you want to alter this vanilla behavior. Setting it to 60 or so means theres a 60% chance the villager will be converted to a zombie upon death. (ONLY ON DIFFICULTY HARD) This means that players abusing this game mechanic will have to risk losing the villager completely if they try to turn the villager into a zombie and back over and over. This does NOT alter the cure rate it only reduces the chance from the vanilla 100% to succeed.
Also fixed a bug with the chested mount blocking code that could be used to duplicate saddles. Please upgrade to this version if you have:
DisableChestsOnMobs: true in your config!!!